| http://www.w3.org/ns/prov#value | - Especially preferred are the straight r-un asphalts used for paving, such as those having penetrations between 40 and 300 and softening points within the range from about 145 F. to about 95 F. Blown asphalts are normally produced in the presence or absence of catalysts by blowing asphalts or fluxes at elevated temperatures with an oxygencontaining gas such as air.
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